There's an ant spray called "termidor" used by pest control professionals (which I am). This bait spray will seriously get rid of ants for a year. Its more expensive than any Home Depot stuff, but it's the real deal. Do a Google search for it or find it on Ebay. Worth every cent, and it's the real solution. Don't spray it on the plant buds, and spray as little of the plant as possible. Those damn ants live in the moisture and stuff in the dirt. Water a little lesw if you may be overwatering, water in the morning when lights come on, and clean up the drain out, If you leave the water on the shed floor, you WILL have ants. Keep it low in the saucer or keep the saucer dry, spray around the saucer. termidor is a bait, they'l take it into their nests, so you don't necessarily need to spray their nests.